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參數(shù)資料
| 型號(hào)： | LTCHN |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA, 3V to 80V Low Dropout Micropower Linear Regulator |
| 中文描述： | 20mA的，3V至80V的微功率低壓差線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 176K |
| 代理商： | LTCHN |
9
LT3014B
3014bf
P2(48V in, 20mA load) = 20mA (48V – 5V)
+ (0.55mA 48V) = 0.89W
P3(72V in, 5mA load) = 5mA (72V – 5V)
+ (100
μ
A 72V) = 0.34W
P4(72V in, 20mA load) = 20mA (72V – 5V)
+ (0.55mA 72V) = 1.38W
Operation at the different power levels is as follows:
76% operation at P1, 19% for P2, 4% for P3, and
1% for P4.
P
EFF
= 76%(0.22W) + 19%(0.89W) + 4%(0.34W)
+ 1%(1.38W) = 0.36W
With a thermal resistance in the range of 40
°
C/W to
62
°
C/W, this translates to a junction temperature rise
above ambient of 20
°
C.
Protection Features
The LT3014B incorporates several protection features
which make it ideal for use in battery-powered circuits. In
addition to the normal protection features associated with
monolithic regulators, such as current limiting and ther-
mal limiting, the device is protected against reverse-input
voltages, and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera-
tion, the junction temperature should not exceed 125
°
C.
The input of the device will withstand reverse voltages of
80V. Current flow into the device will be limited to less than
6mA (typically less than 100
μ
A) and no negative voltage
will appear at the output. The device will protect both itself
and the load. This provides protection against batteries
which can be plugged in backward.
The ADJ pin can be pulled above or below ground by as
much as 7V without damaging the device. If the input is left
open circuit or grounded, the ADJ pin will act like an open
circuit when pulled below ground, and like a large resistor
(typically 100k) in series with a diode when pulled above
ground. If the input is powered by a voltage source, pulling
the ADJ pin below the reference voltage will cause the
device to current limit. This will cause the output to go to
an unregulated high voltage. Pulling the ADJ pin above the
reference voltage will turn off all output current.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.22V reference when the output is forced to 60V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 53V difference between the OUT and
ADJ pins divided by the 5mA maximum current into the
ADJ pin yields a minimum top resistor value of 10.6k.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage, or is left open
circuit. Current flow back into the output will follow the
curve shown in Figure 4. The rise in reverse output current
above 7V occurs from the breakdown of the 7V clamp on
the ADJ pin. With a resistor divider on the regulator output,
this current will be reduced depending on the size of the
resistor divider.
When the IN pin of the LT3014B is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current
will typically drop to less than 2
μ
A. This can happen if the
input of the LT3014B is connected to a discharged (low
voltage) battery and the output is held up by either a
backup battery or a second regulator circuit.
APPLICATIOU
W
U
U
OUTPUT VOLTAGE (V)
0
R
μ
A
50
45
40
30
35
25
20
15
10
5
0
8
3014 F04
2
1
3
5
7
9
4
6
10
T
J
= 25
°
C
V
IN
= 0V
V
OUT
= V
ADJ
CURRENT FLOWS
INTO OUTPUT PIN
ADJ PIN
ESD CLAMP
Figure 4. Reverse Output Current
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